<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=915962
-->
<head>
  <title>Test for Bug 915962</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=915962">Mozilla Bug 915962</a>
<p id="display"></p>
<div id="content">
</div>
<pre id="test">
<script type="application/javascript">

/** Test for Bug 915962 **/

var smoothScrollPref = "general.smoothScroll";
SimpleTest.waitForExplicitFinish();
var win = window.open("file_bug915962.html", "_blank",
                      "width=600,height=600,scrollbars=yes");

// grab the timer right at the start
var cwu = SpecialPowers.getDOMWindowUtils(win);
function step() {
  cwu.advanceTimeAndRefresh(100);
}
SimpleTest.waitForFocus(function() {
  SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false]]}, startTest);
}, win);
function startTest() {
  // Make sure that pressing Space when a tabindex=-1 element is focused
  // will scroll the page.
  var button = win.document.querySelector("button");
  var sc = win.document.querySelector("div");
  sc.focus();
  is(win.scrollY, 0, "Sanity check");
  synthesizeKey(" ", {}, win);

  step();

  isnot(win.scrollY, 0, "Page is scrolled down");
  var oldY = win.scrollY;
  synthesizeKey(" ", {shiftKey: true}, win);

  step();

  ok(win.scrollY < oldY, "Page is scrolled up");

  // Make sure that pressing Space when a tabindex=-1 element is focused
  // will not scroll the page, and will activate the element.
  button.focus();
  var clicked = false;
  button.onclick = () => clicked = true;
  oldY = win.scrollY;
  synthesizeKey(" ", {}, win);

  step();

  ok(win.scrollY <= oldY, "Page is not scrolled down");
  ok(clicked, "The button should be clicked");
  synthesizeKey("VK_TAB", {}, win);

  step();

  oldY = win.scrollY;
  synthesizeKey(" ", {}, win);

  step()

  ok(win.scrollY >= oldY, "Page is scrolled down");

  win.close();
  cwu.restoreNormalRefresh();

  win = window.open("file_bug915962.html", "_blank",
                    "width=600,height=600,scrollbars=yes");
  cwu = SpecialPowers.getDOMWindowUtils(win);
  SimpleTest.waitForFocus(function() {
    is(win.scrollY, 0, "Sanity check");
    synthesizeKey(" ", {}, win);

    step();

    isnot(win.scrollY, 0, "Page is scrolled down without crashing");

    win.close();
    cwu.restoreNormalRefresh();

    SimpleTest.finish();
  }, win);
}
</script>
</pre>
</body>
</html>
